"Thu, 15 Jan 1970 21:10:41"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
21:10:41
General datetime
1970-01-15 21:10:41Z
For Database
1970-01-15 21:10:41
For HTTP1.1
Thu, 15 Jan 1970 21:10:41 GMT